Re-enable WebRtcIsacfix_AllpassFilter2FixDec16Neon

webrtc/modules/audio_coding/codecs/isac/isacfix.gypi

Index: webrtc/modules/audio_coding/codecs/isac/isacfix.gypi
diff --git a/webrtc/modules/audio_coding/codecs/isac/isacfix.gypi b/webrtc/modules/audio_coding/codecs/isac/isacfix.gypi
index 68aa8d09c6013497185be95e37d2cf744a515969..e20177c365f47714d335bcb382e4c60c478144d6 100644
--- a/webrtc/modules/audio_coding/codecs/isac/isacfix.gypi
+++ b/webrtc/modules/audio_coding/codecs/isac/isacfix.gypi
@@ -137,18 +137,11 @@
           ],
           'sources': [
             'fix/source/entropy_coding_neon.c',
+            'fix/source/filterbanks_neon.c',
             'fix/source/filters_neon.c',
             'fix/source/lattice_neon.c',
             'fix/source/transform_neon.c',
           ],
-          'conditions': [
-            # Disable AllpassFilter2FixDec16Neon function due to a clang bug.
-            # For more details refer to:
-            # https://code.google.com/p/webrtc/issues/detail?id=4567
-            ['target_arch!="arm64" or clang==0', {
-              'sources': ['fix/source/filterbanks_neon.c',],
-            }]
-          ],
         },
       ],
     }],